Extrusion blow molding machines, also known as hollow blow molding, are a rapidly evolving plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of the thermoplastic resin is placed in a split mold after being heated, and compressed air is introduced into the parison immediately after the mold is closed, so that the plastic parison is inflated and adhered to the inner wall of the mold. On the top, after cooling and demoulding, various hollow products are obtained. The manufacturing process of the blown film is very similar in principle to the blow molding of hollow products, but it does not use a mold. From the perspective of classification of plastic processing technology, the molding process of blown film is usually included in the extrusion. The blow molding process began to produce low density polyethylene vials during the Second World War. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely used. Hollow containers can be up to several thousand liters in volume, and some have been computer controlled. Suitable plastics for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc., and the resulting hollow containers are widely used as industrial packaging containers. According to the parison making method, blow molding can be divided into extrusion blow molding and injection blow molding, and newly developed ones have multi-layer blow molding and stretch blow molding.

Energy efficiency

The energy saving of the extrusion blow molding machine can be divided into two parts: one is the power part and the other is the heating part.
Power saving: Most of the inverters are used. The energy saving method is to save the residual energy of the motor. For example, the actual power of the motor is 50Hz, and you only need 30Hz in production to produce enough. The excess energy consumption is vain. Wasted, the inverter is to change the power output of the motor to achieve energy saving. Energy saving in heating part: Most of the energy saving in heating is energy saving by electromagnetic heater, and the energy saving rate is about 30%-70% of the old resistor ring.

1. Compared with resistance heating, the electromagnetic heater has an additional layer of insulation, and the heat utilization rate is increased.
2. Compared with resistance heating, the electromagnetic heater directly acts on the material tube to reduce the heat transfer heat loss.
3. Compared to resistance heating, the heating rate of the electromagnetic heater is faster than one quarter, which reduces the heating time.
4. Compared with resistance heating, the heating speed of the electromagnetic heater is fast, the production efficiency is improved, the motor is in a saturated state, which reduces the power loss caused by high power and low demand. The above four points are the reason why flying electromagnetic heaters can save up to 30%-70% on blow molding machines.